Question

i am an odd number. i have the digits 4,5,6.i am greater than 550 and less than 650. what number am i

Answer 1

clearly, you end in 5
greater than 550 means you start with 6, so
you are 645

Answer 2

456<550, so it cannot start with 4

564>550, but it is not even, so it cannot start with 5 as 546<550.

Hence, the number must be 645